Two-Stage Centrifugal Water-Cooled Water Chiller

Unit adopts two-stage centrifugal compressor with high energy efficiency.
Three-phase bipolar squirrel cage induction motor.
Y- △ start, direct start or soft start.
High efficiency two-stage compression and economizer design.
Protection level - IP54.
High-strength aluminum enclosed impeller. Enclosed impeller is more efficient than open type.

The unit supply voltage is optional:
380V/6000V/10000V
Select high voltage to reduce initial investment; require no transformer; save cable cost; save electrical equipment installation cost and machine room investment.

The unit adopts SIEMENS microcomputer intelligent control
Simple operation, complete protection, English interface, real-time monitoring, clear display of all running data, extremely convenient operation.
Capacity adjustment is wide with 10~100% stepless capacity adjustment.

It has perfect protection functions, such as power protection, high voltage protection, low voltage protection, oil temperature protection, etc., which makes the unit running more reliable.
The unit has advanced multiple anti-surge function, and adopts the combination of prevention, control and alarm, so that the unit can meet customers' demand for cooling capacity in a safe range.
Visually display switch state, analog state, input, alarm and fault, etc.

Diversified unit throttling control programs
According to different working conditions and requirements, three throttling programs are available:
orifice plate, orifice plate and solenoid valve in parallel connection, orifice plate and electric control valve in parallel connection.
Orifice plate+electric control valve in parallel connection is the most accurate for throttling control but the cost is higher, so it can be as an optional program.
Each set of orifice plates is customized according to centrifuge and unit performance to achieve the best matching with unit performance.
Since orifice plate has no any movable parts, its reliability is better than various throttle valves by mechanical transmission.

The unit adopts liquid level intelligent control
Adopt static capacitance continuous liquid level meter or floating ball level meter to control the liquid level of condenser so as to make the unit running more reliable and accurate.

Separate oil return system
The oil pump is built in compressor with separate oil return and cooling system, making the compressor lubrication more reliable.
The unit adopts injection pump as oil return component, and uses high pressure gas as power to complete oil return function at low pressure side.

The unit adopts environmental refrigerant R134a
R134a is HFC working medium, which is an internationally recognized environmental refrigerant.

Compact design, small area, low noise

Compressor
The compressor adopts imported famous brand two-stage centrifugal compressor
Three-phase bipolar squirrel cage induction motor.
Y- △ start, direct start or soft start.
Design of high efficiency two-stage compression and economizer.
Protection level - IP54.
High-strength aluminum enclosed impeller.
High speed shaft is made of high strength alloy.
Under normal operation, the bearing life is up to 50000 hours.
It is the most efficient in HFC-134a centrifugal compressors.

Heat exchanger
The evaporator is flooded or falling-film type, and the design pressure at refrigerant side is 0.9MPa.
Adopt high efficiency heat exchange tube as well as external fin and internal thread to be fixed on end plate by mechanical piping expansion. When the standard configuration is 1.0MPa, the water side is 2-3 tube pass, and the test pressure at water side is 1.25 times of the maximum working pressure.

The design pressure at refrigerant side is 1.3MPa. Adopt high-efficient heat exchange tube as well as external fin and internal thread to be fixed on end
plate by mechanical piping expansion. The test pressure at water side is 1.25 times of the maximum working pressure.

The high efficiency economizer has a carbon steel cylinder body, and the internal design is to prevent the liquid refrigerant from entering compressor, and it
has also improved the efficiency of the unit by adding air in the course of compression.

The oil cooler adopts high efficiency plate heat exchanger to control oil temperature, so as to achieve the purpose of cooling the compressor lubricating oil.

Technical Data   Notes:
1.Nominal condition: chilled water inlet/outlet temperature of 12°C/7°C, and cooling water inlet/outlet temperature of 30°C/35°C.
2.Fouling factor of evaporator is 0.018m2°C/kw, and fouling factor of condenser is 0.044m2°C/kw.
3.This parameter is subject to change without notice.

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